Retro Graphics

[Sketchasaurus]

This is exceedingly vague, here are a few questions that you should probably provide answers for here for people to consider taking on this task:
What kind of project are the graphics for?
How much are you willing to pay?
What kinds of graphics are required? Characters? Backgrounds?
What sort of deadline is there?

Also, "retro look" is particularly vague as well, and expecting everyone to know what "Slippy Slopes" even is or looks like probably isn't going to be much help either. It may be useful to provide example screenshots of the particular look in the topic, because I tried googling this supposed game and wasn't able to find anything relevant because that particular title is rather generic.
When looking for people to do work for you, it's best to be very clear and specific. Hopefully this helps.